614 17TH CONGRESS OF IABSE, CHICAGO, 2008 Geotechnical Engineering of the 600m Chicago Spire William WALTON, SE, PE Darren DIEHM, PE Joseph BURNS,SE,PE,FAIA Senior Principal Engineer, VP Senior Project Engineer Managing Principal STS│AECOM STS│AECOM Thornton Tomasetti Chicago, IL, USA Chicago, IL, USA Chicago, IL, USA
[email protected] [email protected] [email protected] Fernando SARABIA Garret BROWNE, SE Suzanne PROVANZANA,SE,PE Assistant Project Engineer Senior Associate Senior Project Engineer STS│AECOM Thornton Tomasetti Thornton Tomasetti Chicago, IL, USA Chicago, IL, USA Chicago, IL, USA
[email protected] [email protected] [email protected] Summary The 600 meter high Chicago Spire, being developed by Shelbourne Development, is now under construction. Santiago Calatrava provided the architectural and engineering design, Thornton Tomasetti is the structural engineer of record, and STS is the geotechnical engineer of record for the project. The Chicago Spire has a very innovative structural system that is a true integration of architecture and engineering. While the project will be very well known as the tallest building in North America, it will also have the deepest basement in Chicago. The top-down method of construction will enable the tower construction to commence much earlier than the conventional bottom-up method. Because of the depth of the excavation and the proximity of adjacent structures, a significant analytical effort to predict and monitor ground movements is being conducted in concert with the construction. Key Words: High rise; caissons; slurry wall; secant pile wall; geotechnical; instrumentation; top- down construction; finite element; performance modelling.